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Why is the output resistance of a transistor very high?
Due to it, a small change in emitter current. This means that a small signal voltage variation at the input of the transistor produces a large emitter current variation. This shows that the output resistance of the transistor is high.
Which transistor that has high resistance?
There is an insulated gate bipolar transistor (IGBT) that is a hybrid of the two. It offers the high input resistance of FET with the low output resistance of BJT. You will IGBTs used in high power applications for this reason.
What is the output resistance of a transistor?
Therefore, Output Resistance ( ro ) = Δ Vce / Δ Ic at constant Ib . The output resistance of the common emitter circuit is less than the common base circuit. Its value is of the order of 50 KΩ.
What is the output resistance of a base circuit?
The output resistance of the common base circuit is very high of the order of several tens of kilo – ohms. (i) Input characteristics: The curve obtain between the base current (I b) and the base-emitter voltage (V be) at constant collector-emitter voltage V ce shows the input characteristics.
What are the characteristics of a transistor curve?
Common Emitter Transistor Characteristics: (i) Input characteristics: The curve obtain between the base current (I b) and the base-emitter voltage (V be) at constant collector-emitter voltage V ce shows the input characteristics. The base current is generally taken along y-axis and base-emitter voltage along the x-axis.
How does a pull up resistor work on a transistor?
Thus the transistor turns ON to pull the output to a LOW level. The size of the pull-up resistor depends on the connected load and the voltage drop across the resistor when the transistor is OFF. When the output is LOW, the transistor must be able to sink the load current through the pull-up resistor.